Doxycycline is effective against which of the following bacteria types?

Doxycycline, a tetracycline antibiotic, is known for its broad-spectrum activity against various types of bacteria. It is effective against both gram-positive and gram-negative organisms as well as anaerobic bacteria. This versatility is due to its ability to inhibit protein synthesis in bacteria by binding to the 30S ribosomal subunit, making it a valuable option in treating diverse infections.

The action of doxycycline is not limited to a single class of bacteria; therefore, it is utilized in treating conditions caused by numerous pathogens, including those that are antibiotic-resistant or difficult to treat. It has notable efficacy against common infections, such as those from Streptococcus (gram-positive), Escherichia coli (gram-negative), and organisms like Bacteroides (anaerobic), reflecting its broad antibacterial coverage, which aligns with the correct response to the question.